<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function makeAdder(a){
            function fn(b){
                return a+b
            }
            return fn
        }
        const addFive=makeAdder(5)
        console.log(addFive(10));
        console.log(addFive(20)); // 25


    </script>
</body>
</html>